BISHKEK -- Kyrgyzstan's acting prosecutor-general says criminal cases against President Kurmanbek Bakiev's two sons, Marat and Maksim, and his brother, Janysh, have been launched by the interim government, RFE/RL's Kyrgyz Service reports.

Baitemir Ibraev told RFE/RL that the three face charges of premeditated murder and attempted murder.

Ibraev said the investigations were launched based on information provided by witnesses. He said arrest warrants for the three have been issued.

An investigation has also been launched against former Bishkek Mayor Nariman Tyuleev. Ibraev said that witnesses told investigators that looting and disorder in the capital were organized by Tyuleev's supporters.

The whereabouts of Marat, Maksim, and Janysh Bakiev are unknown.

Maksim was on a flight to the United States on April 6 as the head of an official delegation, but it's not known if he arrived.

There have been reports that Janysh -- who was head of the State Security Service and a presidential guard -- is still in Kyrgyzstan and possibly with his brother in the southern city of Jalal-Abad.

At least 75 people were killed and hundreds were injured in clashes on April 6-7 between antigovernment protesters and security forces.